Has anyone played it?

YES! ... the plot is certainly lacking, but you can attribute this to the age of the game and its size.... I still remember how my friends and I copied it onto floppy disks, bringing 10 disks each to transfer the files.... but it doesn't diminish its appeal; for me, the main thing is to have a good time battling, and in the first Heroes game, the computer is probably the most aggressive opponent!!!
The campaigns are somewhat weak, but some scenarios, with the most difficult settings, are almost impossible to beat!!!